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Is ring-cupped oak poisonous to pets?
All parts of the ring-cupped oak trees contain tannins, which are precipitators of cellular protein and prevent the cells from functioning normally. Young leaves and buds have the highest concentration of these toxic compounds; as they mature, they become less toxic. Tannins cause digestive problems in cats and dogs, and in severe cases, kidney failure and even death. Ring-cupped oak acorns are sharp and can cause gastrointestinal obstructions if ingested. Quercus glauca species are especially toxic to horses and cattle. Ingestion of their leaves and acorns induces symptoms like depression, weakness, anorexia, the smell of ammonia in the breath, abdominal pain, dehydration, bloody diarrhea after constipation, frequent urination, and discolored urine. Ring-cupped oak poisoning in horses and cattle can often be fatal. Interestingly, domestic pigs have developed resilience to ring-cupped oak's toxic compounds, and use its acorns in their natural diet.
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